Event: Lewisham Summer Cup

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Opponent	Rating	Result
Julian Morrison	2042	0 - 1
Harry Gulliver	1527	1 - 0
David C Helsby	1751	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1907 = (5320 + 400 * (2 - 1)) / 3)